body {
  margin: 0;
  color: #222;
  background: #fff;
  font-family: Georgia, "Noto Serif CJK SC", "Songti SC", serif;
  line-height: 1.55;
}
.site-header,
main,
.site-footer {
  max-width: 46rem;
  margin: 0 auto;
  padding: 1rem 1.25rem;
}
.brand {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  color: inherit;
  text-decoration: none;
}
.brand img {
  height: calc((1.6rem + 1rem) * 1.55);
  width: auto;
  flex: none;
}
.site-title {
  display: block;
  font-size: 1.6rem;
  font-weight: 700;
}
.site-tagline {
  display: block;
  color: #555;
}
.site-nav {
  background: #1c1c1c;
  color: #f2f2f2;
}
.site-nav > ul {
  display: flex;
  flex-wrap: nowrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem 1.25rem;
  max-width: 46rem;
  margin: 0 auto;
  padding: 0.55rem 1.25rem;
  list-style: none;
}
.site-nav a,
.site-nav summary {
  color: #f2f2f2;
  text-decoration: none;
  white-space: nowrap;
}
.site-nav a[aria-current="page"] {
  border-bottom: 2px solid #fff;
}
.site-nav summary {
  display: inline;
  cursor: pointer;
  list-style: none;
}
.site-nav summary::-webkit-details-marker {
  display: none;
}
.site-nav summary::marker {
  content: "";
}
.site-nav summary::after {
  content: " ▾";
  font-size: 0.75em;
}
.site-nav details {
  position: relative;
}
.site-nav details > ul {
  display: none;
  position: absolute;
  z-index: 2;
  top: calc(100% + 0.55rem);
  left: 0;
  flex-direction: column;
  gap: 0.4rem;
  min-width: max-content;
  margin: 0;
  padding: 0.55rem 0.85rem;
  background: #1c1c1c;
  list-style: none;
}
.site-nav details[open] > ul {
  display: flex;
}
.site-nav li:nth-last-child(2) details > ul {
  left: auto;
  right: 0;
}
main img {
  max-width: 100%;
  height: auto;
}
main img.portrait {
  width: 12rem;
}
main figure {
  margin: 1rem 0;
}
.site-footer {
  color: #555;
  border-top: 1px solid #eee;
}
main video,
.video-frame {
  display: block;
  width: 100%;
}
main video {
  height: auto;
  aspect-ratio: 16 / 9;
  background: #111;
}
.video-frame {
  position: relative;
  aspect-ratio: 16 / 9;
}
.video-frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}